| 摘要 |
PURPOSE:To eliminate rotational errors between input and output rotary shafts by permitting first and second stages in a two stage system planet gear device to have same gear ratio while one stage is made of reduction gears and the other stage is made of over-drive gears. CONSTITUTION:While planet gears 3, 6 having same number of teeth are incorporated in a planet frame 1, internal gears 4, 7 and sun gears 2, 5 are also set to have same number of teeth. And phase difference given to internal gears 4, 7 will suffice for applying torque to shafts A, B or adjusting the phase. For that end, a worm gear 8 is provided on the outer periphery of the internal gear 4.
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